Defects in wooden structures, as well as structures made of other materials, are any discrepancies wood, specifications, design standards, project. For even more details, read what Apmex says on the issue. Defects structures due to external influences, called lesions. Defects in timber structures can arise due to errors in design, deviations from the project in the production of construction work violations rules of operation of buildings, fire effects. Wood is characterized bio-damage caused vital functions brownies fungi and insects. Defects in wood caused by mistakes when designing in recently spread to the roof of complex forms: gambrel and mansard with a broken skate, pyramidal, with differences in height, difficult plan. Architects who design project, do not take into account the possibility of creating normal truss structures.

The most robust is the roof of rafters, but they are required, except the exterior walls, intermediate support, but in many cases the projects needed intermediate supports for roof there. There are projects in which the vents and chimneys are in the area . Designers do not always cope with the design of complex roofs, and in many cases, architects dispense with the designers, solving truss system. As a result, project controls appear roofs with insufficient bearing capacity and large strain that do not provide the water permeability roof and the necessary temperature and humidity conditions in the attic. The best roof is one in which the load acting on the roof, passed the shortest path through the bearing elements of the roof and the smallest number of nodes on the interface wall.

In the design of roof structures the main thing is not only selecting the section of bearing elements, but also the development of their sites of conjugation. Nodes pair of wooden elements should be easy to manufacture, clearly fix the place of transfer of effort to take all the existing vertical and horizontal loads, eliminating the appearance of thrust, where possible, to prevent the ingress and stagnation moisture in the nodes. For normal continuous operation of wooden structures is necessary to exclude them from atmospheric moisture water leaking sanitary systems, and to ensure normal temperature-humidity conditions and ventilation in attics and lofts fences. In the design of timber structures should be considered.